When you click "New Game", the screen shows the puzzle statistics - success rate percentage & average time. Keep clicking "New Game" until you get a puzzle with a high success rate and low (under 500 seconds) average solve time, before you click "Start Puzzle". The lower the solve time and the higher the success rate, the easier the puzzle should be.

You can also view previous posts for tips and suggestions, print out puzzles and work them on paper for practice; and remember that the more you do, the better you get!

Perhaps the most important point here is doing a lot of puzzles. As you do more and more puzzles, they will start to make more and more sense and you can move onto the 5X5 puzzles where you can earn more and more points. Keep at it and you WILL get better and better. I promise...